I should undertake you should undertake he should undertake we should undertake you should undertake they should undertake
V-ing form
I should be undertaking you should be undertaking he should be undertaking we should be undertaking you should be undertaking they should be undertaking
Perfect
I should have undertaken you should have undertaken he should have undertaken we should have undertaken you should have undertaken they should have undertaken
V-ing perfect
I should have been undertaking you should have been undertaking he should have been undertaking we should have been undertaking you should have been undertaking they should have been undertaking
Negation
Simple form
I should not undertake you should not undertake he should not undertake we should not undertake you should not undertake they should not undertake
V-ing form
I should not be undertaking you should not be undertaking he should not be undertaking we should not be undertaking you should not be undertaking they should not be undertaking
Perfect
I should not have undertaken you should not have undertaken he should not have undertaken we should not have undertaken you should not have undertaken they should not have undertaken
V-ing perfect
I should not have been undertaking you should not have been undertaking he should not have been undertaking we should not have been undertaking you should not have been undertaking they should not have been undertaking
Interrogative form
Simple form
should I undertake? should you undertake? should he undertake? should we undertake? should you undertake? should they undertake?
V-ing form
should I be undertaking? should you be undertaking? should he be undertaking? should we be undertaking? should you be undertaking? should they be undertaking?
Perfect
should I have undertaken? should you have undertaken? should he have undertaken? should we have undertaken? should you have undertaken? should they have undertaken?
V-ing perfect
should I have been undertaking? should you have been undertaking? should he have been undertaking? should we have been undertaking? should you have been undertaking? should they have been undertaking?
Interro-negative form
Simple form
should I not undertake? should you not undertake? should he not undertake? should we not undertake? should you not undertake? should they not undertake?
V-ing form
should I not be undertaking? should you not be undertaking? should he not be undertaking? should we not be undertaking? should you not be undertaking? should they not be undertaking?
Perfect
should I not have undertaken? should you not have undertaken? should he not have undertaken? should we not have undertaken? should you not have undertaken? should they not have undertaken?
V-ing perfect
should I not have been undertaking? should you not have been undertaking? should he not have been undertaking? should we not have been undertaking? should you not have been undertaking? should they not have been undertaking?